Who Created God?

If something comes into being, it must have been prompted by something else. A book has an author. Music has a music artist. A party has a party-thrower! All things that begin, that have a start, have a cause to their beginning.
Consider the universe. Scientists once held to the "steady-state" theory, that the universe has always existed without beginning.
Cosmological evidence now refers to the "Big bang" as the point in time that the universe came into being. Our space-time-matter-energy universe had a distinct and singular beginning.
Since it did not always exist, but came into existence (had a singular beginning), then some other reality must have caused or created it.¹
Everything we observe in nature has a beginning. God however is in a different category, and must be so. God is different from all nature and humanity and everything that exists, in that he has always existed, independent from anything he created. God is not a dependent being, but self-sufficient, self-existent. And this is exactly how the Bible describes God, and how God has revealed himself to be. Why must God be this way?
Our universe cannot be explained any other way. It could not have created itself. It has not always existed. And it could not be created by something that itself is created. Why not?
It isn't coherent to argue that the universe was created by God, but God was in turn created by God to the second power, who was in turn created by God to the third power, and so on. As Aristotle cogently argued, there must be a reality that causes but is itself uncaused (or, a being that moves but is itself unmoved). Why? Because if there is an infinite regression of causes, then by definition the whole process could never begin.²
Would you like more evidence for God's existence? Please see Is There a God?